Portable drilling and/or boring machine

Abstract

A portable drilling and/or boring machine, for workpieces, in particular workpieces that make up aeroplane structures, such as airframes, wings, cabin, etc., the machine including a jig busing for guiding a machining tool, an expansible clip for blocking the jig bushing in an opening of a screen positioned on and secured to the workpiece, the screen constituting a drilling jig, and means for moving the expansible clip in order to clamp and unclamp the jig bushing and secure the machine relative to the screen, the means for moving the expansible clip relative to the jig bushing including an electric motor, the torque and position of which are controlled.

The invention claimed is: 
     
       1. A portable drilling and/or boring machine for workpieces, comprising:
 a jig bushing for guiding a machining tool; 
 an expansible clip for blocking the jig bushing in an opening of a screen positioned on and secured to the workpiece, said screen constituting a drilling jig; and 
 means for moving the expansible clip in order to clamp and unclamp the jig bushing and secure the machine relative to the screen, the means for moving the expansible clip comprising an electric motor whereof the torque and position are controlled. 
 
     
     
       2. The machine according to  claim 1 , further comprising a screw-nut system for converting the rotational movement of the shaft of the motor into a linear movement of the clamping expansible clip. 
     
     
       3. The machine according to  claim 2 , equipped with damping springs at the nut, providing flexibility for the increasing torque on the motor during the clamping and unclamping phases. 
     
     
       4. The machine according to  claim 1 , further comprising at least one electronic board on which a control module and a power module of the machine are installed. 
     
     
       5. The machine according to  claim 1 , further comprising a Man-Machine interface integrated on the machine making it possible to program the torque of the motor or the clamping force of the clip. 
     
     
       6. The machine according to  claim 1 , wherein the electric motor is brushless. 
     
     
       7. A portable drilling and/or boring machine for workpieces, comprising:
 a jig bushing for guiding a machining tool; 
 an expansible clip for blocking the jig bushing in an opening of a screen positioned on and secured to the workpiece, said screen constituting a drilling jig; 
 means for moving the expansible clip in order to clamp and unclamp the jig bushing and secure the machine relative to the screen, the means for moving the expansible clip comprising an electric motor the torque and position of which are controlled;
 a screw-nut system for converting the rotational movement of the shaft of the motor into a linear movement of the clamping expansible clip; and 
 damping springs at the nut, providing flexibility for the increasing torque on the motor during the clamping and unclamping phases. 
 
 
     
     
       8. The machine according to  claim 1 , further comprising at least one electronic board on which a control module and a power module of the machine are installed. 
     
     
       9. The machine according to  claim 1 , further comprising a Man-Machine interface integrated on the machine making it possible to program the torque of the motor or the clamping force of the clip. 
     
     
       10. The machine according to  claim 1 , wherein the electric motor is brushless.